Back cushion



FIG. 1 is a front view of the design of the back cushion. The rear view of the design is omitted as it is a mirror image of the front view of the design shown in the application.

FIG. 2 is a lateral view thereof. The opposite lateral view of the design is omitted as it is a mirror image of the lateral view of the design shown in the application; and,

FIG. 3 is a perspective view thereof. The opposite perspective view of the design is omitted as it is a mirror image of the perspective view of the design shown in the application. 

CLAIM The ornamental design for a back cushion, as shown and described. 